50-100 houses is not that much. You can find someone in those 100 houses with 1 DOB and post code. Maybe in very crowded areas you'll need one more var. Worst c

50-100 houses is not that much. You can find someone in those 100 houses with 1 DOB and post code. Maybe in very crowded areas you'll need one more var. Worst case scenario you'll end up with 2-3 people.